Yes but it’s a irritating way of looking at things which makes me wary you have fully understood how it will work. You don’t run your automation rules on the KNX controller, talking straight to KNX devices and to Z-Wave devices through an OpenHAB hub. Or vice versa.
Instead, OpenHAB will run your automation rules on an abstract representation of all of your devices, it’ll use the gateway functions to translate abstract commands to KNX commands on a specific physical connection (the gateway) whenever it’s a KNX device you talk to, and will translate abstract commands into ZWave commands on usually a controller stick that is attached to the computer you run openHAB on.
Well even for that simple operations, opposed to if you stay inside either KNX or ZWave, that probably still wouldn’t work without automation rules something barebone like when Item KNX_Switch changed then ZWave_Switch.sendCommand(KNX_switch.state).
I believe to mention that is important for the OP’s understanding.
How? In your KNX control server ?
You cannot map ZWave devices 1:1 to KNX devices so you’ll need at least simple mapping rules like the one I gave.
And that is really an architectural fail and blatant misuse of OH. It is meant to be the controller to handle all automation, and it can do far better than any KNX or other server can do.
So you have 2 systems, each to have automation rules but these only apply to the devices of that system so no interoperability ?
I’d suggest you setup OH to
have “mirror” OH items of your KNX devices which address these through your KNX gateway (assuming your “Savant” can act as a GW, I don’t know that system but would assume it can do that)
implement all your automation in OH rules
add a zwave controller stick to the box you run OH on (Aeotec or zwave.me/UZB or RaZberry)
migrate your ZWave devices to that controller (ex- + include them again)
Finally you can dump the Fibaro home center.
I know that’s a long journey to take but it’s worth the effort since it’ll allow for integrated, comprehensive control such as a scene to set lights AND blinds in one go. That won’t ever work well unless you migrate to have a single controller only (OH, that is).